((a)) ** Role of Attorney General** The activities authorized by this section shall be carried out consistent with guidelines approved by the Attorney General.

((b)) ** Warrantless inspections** The Secretary may stop and inspect, without a warrant, any person or means of conveyance moving—

((1)) into the United States to determine whether the person or means of conveyance is carrying any plant, plant product, biological control organism, plant pest, noxious weed, or article subject to this chapter;

((2)) in interstate commerce, upon probable cause to believe that the person or means of conveyance is carrying any plant, plant product, biological control organism, plant pest, noxious weed, or article subject to this chapter; and

((3)) in intrastate commerce from or within any State, portion of a State, or premises quarantined as part of a extraordinary emergency declared under upon probable cause to believe that the person or means of conveyance is carrying any plant, plant product, biological control organism, plant pest, noxious weed, or article regulated under that section or is moving subject to that section.

((c)) ** Inspections with a warrant**

((1)) ** General authority** The Secretary may enter, with a warrant, any premises in the United States for the purpose of conducting investigations or making inspections and seizures under this chapter.

((2)) ** Application and issuance of a warrant** Upon proper oath or affirmation showing probable cause to believe that there is on certain premises any plant, plant product, biological control organism, plant pest, noxious weed, article, facility, or means of conveyance regulated under this chapter, a United States judge, a judge of a court of record in the United States, or a United States magistrate judge may, within the judge’s or magistrate’s  jurisdiction, issue a warrant for the entry upon the premises to conduct any investigation or make any inspection or seizure under this chapter. The warrant may be applied for and executed by the Secretary or any United States Marshal.1